title: Vaccine evaluation by case-control or prospective studies.
authors.affiliation: Department of Epidemiology, Johns Hopkins University School of Hygiene and Public Health, Baltimore, MD.
authors.forename: G W
authors.initials: GW
authors.lastname: Comstock
mesh_terms: D001500:BCG Vaccine / Q000008:administration & dosage*; D016022:Case-Control Studies; D004341:Drug Evaluation; D011446:Prospective Studies
chemical_list: D001500:BCG Vaccine